Twin sisters, the horny game

Hello I am Bert now 40 years old. This story happened 12 years ago. I have been married for 18 years with one of twins. The girls look like two drops on each other. And are now 38 years old. And still very nice to see. My brother-in-law is a bit older than me. They came to visit us this evening. It was very cozy and my brother-in-law and I were playing around and one of us said so. We can play a...